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You need to get one that works on the same wide range frequency as the reciever in the car, and then it's a simple matter of opening both the new and old fobs, and matching the fine frequency settings by putting the little switches inside where they should be according to the old fob's switches. If there are no switches in the old fob, it's preset and there's not much you can do about it.

Once entering this procedure, programming the first transmitter erases all previous transmitters. You must program all transmitters.
Program one vehicle at a time. One transmitter could be programmed into other vehicles that are also on
program mode in close proximity.
1. Sit in the driver's seat.
2. Remove the ignition key from the ignition lock cylinder.
3. Close all vehicle doors.
4. Press and hold unlock on the door lock switch.
5. While holding the door lock switch in the unlock position, insert and remove the ignition key twice. Do
not rotate the ignition lock cylinder.
6. Insert the ignition key a third time leaving the key in the ignition lock cylinder. The ignition must remain
in the LOCK position for the rest of the procedure.
7. Release the door lock switch. You will hear three chimes. This chime feedback indicates that transmitter
programming is active.
8. Press and hold the lock and unlock buttons at the same time on the keyless entry transmitter for 12
seconds. You will hear two chimes. This chime feedback indicates that the transmitter has been
programmed successfully.
9. Repeat step 8 for the rest of the transmitters (for a total of 4 transmitters).
10. Exit this procedure by removing the ignition key from the ignition lock cylinder.

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Related Questions:

1. Get in your vehicle.
2. Close the door.
3. Put key in ignition
4. Do not turn on the ignition yet.
5. Hold down on the unlock button on the door panel. Do not let up.
6. Turn the key to ON, OFF, ON, OFF (while still holding the unlock button on the door panel).
7. Release the unlock button.
8. The door locks should cycle, indicating that you did everything correctly.
9. Have all your remote entry fobs available. Hold down on both the lock and unlock buttons until the door locks cycle. Do the same on all key fobs. This will re-program all of them.
10. Turn ON the ignition key to exit the program mode.
11. DONE.

Walk out to the vehicle with a new battery in the key fob and press the lock AND unlock button at the same time while you stand close to the vehicle for 7 seconds. You will hear the doors go thru a lock and unlock cycle, your fob is now programmed. This will sync existing programmed controllers, security sync. to program new remotes:In the trunk, connected to the wireless remote controller (driver side on wheel well, need to remove 'mat') is an empty connector with 2 wires connected. short the two connector pins. The locks will all cycle. Press and hold lock/unlock buttons on remote until locks cycle on/off. repeat for other remotes. Remove short across connector pins. Test new remote(s).Warning:existing remotes are deprogrammed, only remotes programmed will work from now on.This worked on my 1998 Cavalier. Be sure battries in new remote(s) are good! Answer Locate the data link connector under the dash (under the steering column). Ground out pin #8 of the DLC (top right port) with a jumper wire to any piece of metal close by (I use the e brake hardware). The door locks will then lock & unlock to let you know you are in the programming mode. Simultaneously press & hold the lock & unlock button on one of the keyless entries until the locks cycle (this lets you know the transmitter has been programmed). Repeat this step for your second transmitter. You must reprogram the 2nd transmitter within 60 seconds of programming the 1st one or you have to start over. Note

It is a PAIN. You have to be very precise and have good timing. I had to repeat the whole thing about 4 times before it worked. As a side note, a great place to read EVERYTHING about your car is at rl.acurazine.com it is terrific.

• This system accepts up to two transmitters.
• Entering the programming mode cancels all learned
transmitter codes, so none of the previously
programmed transmitters will work. You must
reprogram all the transmitters once you're in the
programming mode.

1. Open the driver's door.

2. Push up the driver's door master power door lock to
the unlock position. Hold it there for the rest of this
procedure.

3. Insert the key in the ignition switch, then remove it.
Repeat this four more times within 10 seconds.
(Steps 3 and 4 must be completed within 10
seconds, or the system will exit the programming
mode.)

4. Insert the key in the ignition switch. Make sure the
power door locks cycle to indicate that the system
has entered programming mode.

5. Press the "LOCK" or "UNLOCK" button on the
transmitter. Make sure the power door locks (all
except the driver's door) cycle to indicate that the
transmitter has been accepted.

6. To program a second transmitter, press its "LOCK"
or "UNLOCK" button within 10 seconds.

7. Release the master power door lock switch to exit
the programming mode.

Close the door, use remote and press both lock and unlock at the same time until you see red light on the remote blink. Then release and press unlock. It will fix the problem. I call Tustin Acura dealer and got the answered.

turn key to on,but do not start,press and hold the lock button for one second,turn key to off position,turn the key on and off three times ending the cycle with the key in the on position,press the lock button,you will hear the door lock cycle,press lock again to set code.

Assuming the car battery is ok (if not, buy a male to male cigarette lighter at the auto store and connect to another car until charged enough to unlock the doors...but don't try to crank the ignition!). The trunks won't open if the battery went dead with the alarm set because arming the alarm physically locks the releases.

Sounds like the key code is switched off because you replaced the key fob battery. Try unlocking the car manual with the key in the door lock. Then switch the ignition on to reactive the keyless entry. If this does not work, you might also try pressing the fob unlock button with the key in the door lock until the dash led flashes.